Changing To Goldfish Due To Family Members Being To Rough For The Deli

[guppyguy1234]

I need to know what needs done to leave my tank ready for 2 fantail goldfish like telescope goldies and maybe some white clouds or flag fish I want to change to gravel aswell the filter is cycled and I'm certain it's not as easy as just removing heat and adding fish all help appreciated thanks ps I've been a fish keeper for 2 years of tropics ino my stuff
The tank

 

[Ch4rlie]

Very first question is, what size of tank do you have?
 
And what filter you plan on using?
Do remember that goldies are messy fish so a oversized filter for your tank size would be a good idea.
 
Changing the substrate is all well and good, but do remember a lot of your tank bacteria you need is on the substrate itself, so by removing the substrate, you will be removing bacteria which is likely to result in a mini cycle starting, so do test your water when you change the substrate to ensure tank is ready before adding any stocking in.

 

[guppyguy1234]

It's the same tank I showed before the 100 litre and the filter is an eheim internal pick up 2000 I think

 

[Ch4rlie]

100 litres is basically 25 US Gals.
 
I think 100 litre is the minimum for one fantail goldfish
 
" Tank size is the biggest mistake that newcomers to goldfish make. Fancy goldfish need a tank that is a minimum of 100l for one fish, with an additional 50l for each additional fish (so, 150l for two fish, 200l for three and so on). While they can be started off in smaller tanks, getting a larger one should be made a matter of priority, as goldfish are fast growers in their first few years. "
 
Quoted from :
 
http/www.fishforums.net/index.php?/topic/417799-goldfish-for-beginners/
 
Well worth reading up on that article for some goldfish information.
 
But, 100 litres is a fairly good size of tank for a shoal of WCMM, I like these little temperate / coldwater fish myself and have considered getting some of these guys many times
 
More info on WCMM :
http/www.seriouslyfish.com/species/tanichthys-albonubes/
 
Not sure which flagtails you speak of, Florida Flagfish are what springs to my mind as these are fine in coldwater set ups (18 - 30C or 64 - 86F) and will be fine in a 100 litre tank for a pair.
 
More info on Florida Flagfish :
http/www.seriouslyfish.com/species/jordanella-floridae/
 
(if you are thinking of Flagtails, I must mention certainly not Flagtail Prochilodus as these are far too large for a 100 litre tank)

 

[fluttermoth]

I'd quite like to know what it is that your family members are doing, that you think you need 'tougher' fish?

Coldwater fish are no tougher than tropical, apart from temperature, so you might still have issues, even if you change over.